108 Miscellaneous. 
On the Morphology and Systemttic Position of the Epicarides of the 
Family Dajide. By MM. A. Grarp and Jutes Bonnier. 
In a previous paper (see ‘ Annals,’ ser. 6, vol. ill. p. 512), for reasons 
derived from the ethology of the animals, we have regarded the 
Dajide as a group intermediate between the Cryptoniscians and the 
Bopyrians proper, with which they would be connected by the 
family of the Phryxians. This viewis now confirmed by the anato- 
mical investigations which we have been enabled to make of some 
types of this group, which is still so little known and so badly 
represented in collections. 
The Rey. A. M. Norman has been kind enough to send us a speci- 
men of Dajus mysidis, Kroy., collected at the island of Jan Mayen 
upon a Mysis oculata, Fabr., during the Austro-Hungarian expedition 
to the arctic seas *. He has also submitted to our examination an 
Aspidophryxus parasitic upon Erythrops microphthalma, G. O. Sars, 
and dredged by G. O. Sars himself upon the Norwegian coast. 
The unique specimen of Dajus mysidis figured but not described 
by Kréyer was a young female, accompanied by a male in the 
Cryptoniscian stage. The six females collected at Spitzbergen 
during the Dutch ‘Willem Barents’ expedition and studied by 
Hoek were also immature, and only one of them bore a male in the 
second larval form. Buchholz alone has described the adult male 
and female of Dajus mysidis, Kréy., under the name of Lepto- 
phryxus mysidist. But his description is very incomplete, espe- 
cially with respect to the inner antenne and the incubatory plates. 
Of the latter there are five pairs as in all Bopyrians, and the fifth 
pair, which escaped the notice of Gersticker, is the most developed. 
This forms the greater part of the incubatory cavity. The body, 
bent ventrally on each side, also takes part in the formation of this 
cavity. The morphology of the head and thorax differs little from 
that of the same parts in the Phryxians. However, the feet of the 
sixth and seventh thoracic segments are entirely wanting, thus 
reproducing an embryonic arrangement which is transitory in the 
other Bopyrians. Further, the first five pairs of feet are very 
closely approximated to the anterior part of the animal, where they 
surround the aperture of the incubatory chamber. The metameri- 
zation is very Visible upon the middle of the dorsal part in both the 
abdominal and the thoracic regions; in the latter the segments 
increase in size from before backward. On the pleon the first pair 
of feet alone are well developed in the form of biramose lamelle, 
which, in this part, close the incubatory chamber. The other 
pleopoda are rudimentary, with no pleural lamine; there are two 
uropoda. 
* We keep the name of Dajus mysidis, Kroy., for the parasite of Mysis 
oculata, and give that of Dajus mixtus to the Dajus found by G. O. Sars 
at Vadsée upon Mysis mixta, Lillj. 
+ ‘Zweite deutsche Nordpolarfahrt in den Jahren 1869 und 1870,’ 
Bd. ii. Abth. i. p. 287, Taf. i1. fig. 2 (Leipzig, 1874). 
